[all variants] Slow SMB and NFS with Linux Client

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http://ubuntuforums.org – Hi! I've a really annoying problem, which i was unable to figure out over the last..i don't know, months.. First, i have an Ubuntu Server 13.04 Installation on my Home Server. I use SMB and NFS to share folders in my Network. Some time ago i noticied slow Transfer Speeds (about 2-3Mb/s) on my Laptop using Kubuntu 13.04. At first i thought of poor wifi support for my Intel card, but i also noticed considerable slow performance when connected via cable. The problem hower does NOT exist when using Windows. What's also interesting, using FTP i get normal Performance (~80MB/s over LAN and ~14Mb/s (Hardware)